I found the website first, and I was very impressed with it. I started the exercise program and got all the way to week 4, but then started to struggle with progress. I then started to wonder if the book might provide more information that could get me past my plateau, so I bought it.
Quite frankly, I think there is actually less info in the book. The extras that the webite refer to are simply trivia and historical facts about other people's press-up records. Nothing in the book provided extra training tips, or advice on form, that I could use. Not only that, the sets of press-ups required to complete each training session are completely different in the book to the ones published on the website, so to continue with the program I was already on I would have to ignore the information in the book I just paid for!
I have switched to the sets planned out in the book, and I am now making slow progress again, but I don't think it's the book that actually helped me. If you haven't lost money on this product already, I would suggest you steer clear and use the free online version.